Sometimes things are easier than ones might have thought. I wanted to merge some mp3 files in the shell and found that this can simply be done using
$ cat my_file_1.mp3 my_file_2.mp3 my_file_3.mp3 > combined_files.mp3
Forgiving players like
mplayer can handle the resulting files without any issue. Still, it’s recommended to fix the file header e.g. using
$ avconv -i combined_files.mp3 -acodec copy combined_files_fixed.mp3
Have you ever tried to listen to podcasts or videos at increased speed to save time? Actually this usually works out quite well with a speed factor of 1.5 or so. You can do this using mplayer:
$ mplayer -af scaletempo -speed 1.5 <FILENAME>
This will run the file with higher speed without increasing the pitch (so no Mickey Mouse voices 🙂 ). Use “[” or “]” to decrease or increase the speed. It is a good solution that can be used on a PC/Mac but if you have a mp3 player device with fixed firmware like me you cannot do this there. So I created a small script (gist at github) that uses mpg321, SoX and lame to generate mp3 files which I copy afterwards to the device.
Run the script with one or more mp3 files:
$ speedupmp3.sh <FILENAME(S)>
$ speedupmp3.sh test1.mp3 test2.mp3 test3.mp3
[...] # Some output
The latest Ubuntu netbook edition (10.4) is organized in different workingspace (I am not sure what is the official expression for it) like “Favorites”, “Accessoires ” and “System”. I wanted to add an icon to the “Favorites” section to run a shell script that performs a backup. This can be done the following way:
- Go to the “System” workspace and open “Main Menu”.
- In there create new item e.g. in “Accessoires”.
- Give it a proper name like “Backup” or whatever your script does.
- Fill the “Command” field with something like “gnome-terminal -e ‘~/bin/my_backup_script.sh'”. (Please read the gnome-terminal manual if cannot guess what this does – “man gnome-terminal”)
- If you want you can also explain the script in the command field.
- To save and finish click “Okay”.
- Now you have created a new short cut. So go to “Accessoires” where the new icon should be found.
- If you hover the mouse over the icon a “+” symbol should become visible. If you click that sympbol the icon is added to your Favorites.